Seven former directors of the Central Intelligence Agency asked President Obama on Friday to shut down the new Justice Department inquiry into past abuses during interrogations of terrorism suspects, arguing that it “will seriously damage” the nation’s ability to protect itself.

In a letter to Mr. Obama, the former C.I.A. chiefs said the cases under study had already been examined by career prosecutors who found that no criminal charges were warranted. To reopen cases based on a change in which political party controls the government, they wrote, will make it harder for intelligence officers to take risks without worrying that some future attorney general might investigate them.

“Those men and women who undertake difficult intelligence assignments in the aftermath of an attack such as September 11 must believe there is permanence in the legal rules that govern their actions,” the men said in their letter.

They argued that the new inquiry would result in the disclosure of information about past operations that “can only help Al Qaeda” elude capture, and would convince foreign intelligence agencies that they could not trust the United States to protect secrets.

In effect, they are asking Obama to intervene and squash the DOJ’s investigation, to essentially act like a third-world dictator rather than let the Attorney Genereal do his job as an independent investigator. How much harm does it do to our national security to have a puppet for an AG? One need only look at the Bush Administration to see the answer; had the AG been independent under the Bush years, then we might not have had any reason to investigate the CIA now.